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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '187ba6cdfa20bad0bbdbc3ffa64330d3987c7eecf057f0c01a3c4f6c8330150c' 
  AND token = '19czwzxtexxkZc5sGqrhlwz1ne9B7e8BEcyqSo28ESk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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