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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281bde24fa5d256515c29f53eef03e41ebd84df1a6ca2e1685c456d55cb03e3b' 
  AND token = 'vDUJGmkgvvUcqscsJaqBioRxaOTe05ckZhWH4X7V7RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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