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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99b4d2057da59a614e53d1ea1b97359ad35dacef36672d9d9f404a1f3278d64' 
  AND token = 'IzgTXmmIp3+z3EBiH0DKp/HG1/dedd2oShEMlH02eCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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