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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672ebb6fcc4c4305d2078a559f56f52ccca1607db3a7e1b492920852c2e1ecde' 
  AND token = '/pJ/jrZqlMc2nGmhACo7vZtS4F/ESms6ySpr4jtlt0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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