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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a95f964e75d22b0239710acd2a7d69501f638319f338f920749a4cf9aec0891' 
  AND token = 'njUVvXApqee1cFutsI7+Q5IxkBRT2TWFZaTu4mF9vWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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