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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9efca74b0926cc7841a48694cd4e84fcbb6ccd52724280eadc91f6e0636c9d' 
  AND token = '36eCIVF9XglM2Rr5JADPxSbjtJmaAWv6NkdE5h1+Qjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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