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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48383b7c27c444166d3f8fa7736256d455dc9492f8b419eebfa7e2ad17f17b2' 
  AND token = '70ph/OgKNKcS/XCTb8yC/EWZt40rUhtK9IpU5m9M+Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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