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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9ccc925c0687d7f1d41cdcd3d70f36ef30db373758ea009f4416c0900853f2' 
  AND token = 'R+qi/BbtJcdMsZO4E2vh2ArOO5Nz11sEGtzh4JGVnLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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