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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9023ef4e6e9f48845b2c98cf390fbebf8c26ffb5a95cef3cd29190639dbf2230' 
  AND token = '/37VrxwnEHOEAaJMcDN7KCVzbJTok0z9L4I/dtTGyOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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