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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01552da32510f4513d51bfacdbc71477023c5e879d2dd355ea07b68543e8eafb' 
  AND token = '9bILNw8+O3VrBlHZvqEkXQcI/Vu/rIukdamkMKvwXlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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