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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23e37ae860ae9d6af7374c4f4c94ce9219961f31ccaaafa8b4399fc45aa0767' 
  AND token = '1e+nb26jOQ1zRSA3FVpnyx9mFM8mwmpu8x6DUF46c30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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