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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b83376f84479b7cb80a054deb2ba775d509b5c05b71a0ff3eb4b37398bd060' 
  AND token = 'xmZgQc0gQD0x321tWIn7IdNPegP2jalOZOtCsfTckqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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