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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b495549965966da4bd74d9989279d47e037021e74cd3c65604b1720a8ee0d16c' 
  AND token = 'tkh4JKdGN9t5egJxqTqblDc2gID0eE+2gAczo93cDFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}