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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff84c02dbd0bcca5dfa8043170aabff931e16f651ae7ed7aa47fc30ca26cabe' 
  AND token = '0m1e+c+DLHh3Ymn5kTJeoJNTS+VfOCliA7wuwypD4yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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