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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29433e1a706b29cb76ca714f0db7469ff7e6e8efefa097454f024590097b00fe' 
  AND token = '1Y+ijkW5rmp5xu+hf1XgXi8wEqTysSMlxv32WvpH9C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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