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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de301489e477e6d645f838ba309ae341c4de927956f1fc96e8621984bead45c' 
  AND token = 'mWTLxUuTobGTlwrWxQnpbMbhGjhRL/LOkDoR5D4ooJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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