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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813e08fdd42638f29573d238afdd874eaa4fb65a955bd63f01919cccefddb886' 
  AND token = 'FdBufAC0tmlaRqTR+KBoW7V20DqZAy0qedz2D6z6PaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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