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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79029bc9cfdbf0ce70875adcb256e3983d6023bb5540290637af530c64e2c16' 
  AND token = 'Sgay8UPP6wyVedNsRHwFtmh7m5Z2oiHHqB2b2L2pyK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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