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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef5380f3d6ad590941d96135b6fe66a0c4ba5d0f91fe2e7dead283af8e8a04e' 
  AND token = '1BwXq5w47ASL9Tq76k0Z6v0d4/QGLIm/M23O55U/dpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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