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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57b1fed02a7efe79ffdee0a81940e5947dc0a82ec7b62a90fffe16a87305e74' 
  AND token = 'WgJRi7x/+XJtZpnTMythClgReBR80QAPKX6ezJNQO7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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