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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a3884b4baed6afcfbe487f0d33b8d558325af7d1249b3e1eec637ceac95e05' 
  AND token = 'EOx83jCmiltwnkOSDmT1ntsbvgYdOFW6vOKb3dxCDUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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