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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87255fd94006a8d5fd8c1374209a0ad5eafa5a4e040897c2c8ecd01968f6c1ce' 
  AND token = 'DhyPZnQC1Rzr5okt0hmO9eI1d8vC6vUWBoikmRqMgKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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