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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0bbbd821f9120788741a2e69d2de8e8a1f8cc6cc08a1e23a7cf3530cc3792a' 
  AND token = 'EkuTF+jmuPPfTSd92TY4ZOC8L2FYfegKhJPYGEJfyp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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