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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d74d3d2abe5c44d8e209220b07747148a582889219ecd70a5f9ce151b3c3cbc' 
  AND token = 'UCSEuFvKK3b3dpciPpNqzy9i7p93JJvQVmjJ1ZY+sN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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