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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa3201cbd2bd438ba4de7e8f28a47ec986c7ef2910d94186011995e85d492bd' 
  AND token = 'iiu1LpuYjPqkrYdPvBJCqxt97CX1Xcv8zX8qNzxxOG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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