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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7b71976a940dd422dca8aed1c397127e3b9e17cdb923dcbd2e51d026675394' 
  AND token = 'LH5EiRPXDoh4bNp+Llcc11+Z57xpMXXdEZwV4kkVNOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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