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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8097e4485ba9400a163836b4343e728c58e8983a997a3ed4290fbd3d090b27ba' 
  AND token = 'Hfg3aQLTGpplOgKuI1P766LaNHFjKi6zLXv9wZ4nLB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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