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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57eef7e2d6cb76d1f9bc9ebd476c64345caddc67e5a442b5e68f4747e87302e4' 
  AND token = 'mpmJRQDaxAGLxweR0lni32z6Y3CIcAiRMQt0ce2Lex0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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