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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79fc9ee64b6aaacfca03ceb9b20f800fc407a0a01a8ec49fe03b25b5533d5702' 
  AND token = 'PQ07Qfr8mOy+hGW/aMgdIaBCxWtxO6tGyR5Q8GD9eoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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