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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda5be54e7ae796f28f8d1156ac4df81d3f1aa3cb7a4dde7b05ce9ec27d1d66e' 
  AND token = 'r36aZmvR/Ow84E+EtmCeZAj6ukhVOcoz06kSuBgp+tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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