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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2def63554e5e34823e8ce1b9958deb277b5ca40d9e1f459084fa135237830c0' 
  AND token = '1k5ulXRjvrNVdJIgkSqSdAoWZGqEPnC6omzXRyMTnbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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