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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf62bb7c0d71a19e8569853ad54bf63472612b9ab3edd8abade26ad5ad9730d' 
  AND token = 'Ba/QlM/4ocn5Njkt68cRbosuhJA8r92XDiexbd5rtKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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