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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6eebf504ab3633355289a910faaf905e799b6b4358ecff9c9983e88170eb27e' 
  AND token = 'XsV0b45kVvx2XRJaHCPSC/s7/uc+wGU2kXdRKDccx50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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