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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e97362690f0d4c1e65703238d1b1ad19c83c212888c9068c51014056f9fbad2' 
  AND token = 'YVmFds3RTvfbNhjbe2D51A+RXUxXN8+9XwPEAmr+L6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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