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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44ccc18dc7ab77940181dc5f0f8b5c12e48e41b0e63c17340ddd80f5b840183' 
  AND token = 'ULU72LT4s54QsHbILXA5aMLhTkN4a9eVEzSKJR5lqmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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