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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92359457b86b3cb6b1e7a8709a1f13c22eed7a47336a98a92491e56714d59e8' 
  AND token = 'E+yBiG9fvZzN5n2rx9oGsqH+5sMUR4Y4HWn58EpF6R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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