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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda52b60c777f84f697b7eb56c8aa1f5d692fdb5f8d0beac8f326936f6a5b21d' 
  AND token = 'c/r0etTTQfh3ko4ZDZc7gy1dLGAJYir0YGGTsDEIK3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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