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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a2aa3a89096ac2ef42ceaf519a1bce98b0a0c7e21e064c5c94c86e1079edbf' 
  AND token = 'd8gmfE813YvulGQ0vT+5Zslp1b2Bsbijr1YbPnGS6L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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