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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e2e1369f523358e2b7109b81b4185027f49af11f3a907ff3722042831069a3' 
  AND token = 'zvsK4hA9C/zuCjN1ow1Y9XbhLU2dtEiArTwkIwoD0sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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