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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb86cbb5f329bb1c0a6034b4e3af3ba4ffe11443cd79c7a59678d485e18ea08a' 
  AND token = '10vJdrrlN14uXB73/7hhbRbeRyKQfrHftkBjFRcs/w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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