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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88d2e1fa24c5a577d3bd6638a3cb909cb44433f1617a33704b2c55a13cd8eec' 
  AND token = 'fPGVVUFrc02RmjLtvnlC7kK6OctIKqD51pKNv++So5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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