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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069612ce0a6d204ae270b787959376a208c824c51fdb156a1cfaa779ed49e6d9' 
  AND token = 'CPm2TRJh7GuBxGK1iuZUK1lHf988R44tDL1SOfrsqr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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