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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73cc9c64dc11dca2984d9ce6d80d3a743547e128fd23adf6efc89d3996cb197' 
  AND token = 'kcQyNhdb3KFC6p203fncqK4bVykSR/+64g+8DyENF3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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