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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e70dfd4561bff0f7118b1a5fc133e30276ae87f61cb47263fc4b914a82eafe2' 
  AND token = 'ugu/gZmQX+cr3QKq16Hy34FvdjDAF+Ha9nz2mjAHTNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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