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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2279777c8006b5d583c76d8705bcc4eaf88791784d1e8122d69f8a8500cb3f' 
  AND token = 'xbAeO1NRBL7rhLlc7Um5F9FBAWO17PIvTnnkvprdNIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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