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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5514901bd30f9b53213f5df654143c89b85aab3085728a61fa894e61b061a4e4' 
  AND token = '4wjEii5qKvy0b1m0gEBibOI1xCUh0oqee+TAJ4kdmNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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