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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524cb254af447f7b2e7eac32131962a0e0b4121277c62b4ca0da87878b72d557' 
  AND token = 'RffbFvbZIMQRrL9uL0h1+TH2zuW3Myhn+RSXH6rs9UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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