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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7754c52ca136d4c59d1ca27b87a3395134ec3dabde3e8c8f820347bcb5d7af79' 
  AND token = '/HQZB+hoAyHTxB1BNty7GYr8vQyJEup8f8Zv299s9jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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