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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b6584f6436d4dd88c6f344bb4329d90cdb2246be7385d1293f7d4120c305bf' 
  AND token = 'P+pRfatF+smLBBz1YcorzqPFocWcWbt9vKao8J6o2VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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