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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbb2ac84e9f94998bf5135133a2c92ffa213b94b0895c5cd7f985edbed5bc16' 
  AND token = '5vE9hdN0MkRhpJJukztpcIIw6yBxqxIK2LEDeFA3vOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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