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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ba658a575acfa70452f46f977cc488a14e0405220d6562e7ff0886f2350acc' 
  AND token = 'UfUGemPb/aE3vOC2BtDCv2DdlC87y6Qhp7QK00xJoqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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