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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f2f02604c4974aa2277c9a01be609f20907d413293940409d77d233d72751b' 
  AND token = 'pPCniKs4o7mCd3Nkkc+T05pWImTPh+P3f89zp0NRGsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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