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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34362fafeb9d3c256d9c89f50622807fcbc1751c01fbd06d3c00aa5e3bd2277f' 
  AND token = 'd5EbJWVHfS5oXvdCXAld+7qkVN0A6XgzAVqvPT1IOpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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