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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34979ec6f23555915ed5521dde821bf7263c0a1f662e7e152eafb1e93eb8ec3d' 
  AND token = '6O9+Hn/F7TEfatDSe3la+qaQ5HlawRQfwOSiGjgxPjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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