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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f539b1ba5007ef1f9df6b841d81d95b0ff630a17362f4075068d041b86f229' 
  AND token = 'OwJB7iPuCSSrMfbnHvz/30P+ZF2bWf2sJAOELd+4jMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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