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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a47db594dccda986d6761dfce7b8e9f0963151e148fe3b77e30e80d25f424bc' 
  AND token = '5C9x7YV61y9ntmKpKfX/zUoi17LbO7SpSYaDlivuEqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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