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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a6cb5342613ca72f0f5926645e12702783d978c570bca23441d4010c59ef3c' 
  AND token = 'es6+vQjQJe6oc40rJ979f3kpH/gVuGhptxzoI6IwyMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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