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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5edeb53c0e4a07e7fd59abeaf4a84f2971bf5df965f61b825c36a00537018acf' 
  AND token = 'J9v+PJgr/KX92FPmSdP6wzklx0i4X3PkIgTtd3p60S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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